不幸的是停止了，可能是由於錯誤的應用

「不幸的是應用程序已經停止」

這是工作之前，我做一些改變。。那麼它不工作，我不知道爲什麼！

我的計劃是一個GPA計算器

MainActivity.java

package com.mainuser.gpa.gpa; 

import android.content.ContentResolver; 
import android.support.v7.app.ActionBarActivity; 
import android.os.Bundle; 
import android.text.TextUtils; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.widget.Button; 
import android.widget.EditText; 
import android.widget.TextView; 


public class MainActivity extends ActionBarActivity { 
    Button mcalculate; 
    TextView mshowResultTV; 
    private EditText meditText1; 
    private EditText meditText2; 
    private EditText meditText3; 
    private EditText meditText4; 
    private EditText meditText5; 
    private EditText meditText6; 
    private EditText meditText7; 
    private EditText meditText8; 
    private EditText meditText9; 
    private EditText meditText10; 
    private EditText meditText11; 
    private EditText meditText12; 
    double gradnum1,gradnum2, gradnum3, gradnum4, gradnum5, 
      gradnum6, hournum1,hournum2,hournum3,hournum4,hournum5, hournum6 , pointsum=0, hoursum=0; 
    double x, y, z; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     initControls(); 
    } 

    private void initControls() { 

     meditText1 = (EditText)findViewById(R.id.editText1); 
     meditText2 = (EditText)findViewById(R.id.editText2); 
     meditText3 = (EditText)findViewById(R.id.editText3); 
     meditText4 = (EditText)findViewById(R.id.editText4); 
     meditText5 = (EditText)findViewById(R.id.editText5); 
     meditText6 = (EditText)findViewById(R.id.editText6); 
     meditText7 = (EditText)findViewById(R.id.editText7); 
     meditText8 = (EditText)findViewById(R.id.editText8); 
     meditText9 = (EditText)findViewById(R.id.editText9); 
     meditText10 = (EditText)findViewById(R.id.editText10); 
     meditText11 = (EditText)findViewById(R.id.editText11); 
     meditText12 = (EditText)findViewById(R.id.editText12); 
     mshowResultTV = (TextView) findViewById(R.id.showResultTV); 
     mcalculate = (Button) findViewById(R.id.calculate); 

     mcalculate.setOnClickListener(new Button.OnClickListener(){ 
      public void onClick (View v) 
      { GPAcalculate(); }}); 

    } 


     private void GPAcalculate() 
    { 
     x = CalculatePoints(); 
     y = CalculateHours(); 
     z = x/y; 
     mshowResultTV.setText(Double.toString(z)); 
    } 

    private double CalculatePoints() { // multiplying each grade by hour the add to pointsum 

     gradnum1 = Double.parseDouble(meditText1.getText().toString()); 

     if (isEmpty(meditText3)== true){ // if the edittext empty set it to zero 
      meditText3.setText("0"); 
      gradnum2 = Double.parseDouble(meditText3.getText().toString()); 
     } 
     else gradnum2 = Double.parseDouble(meditText3.getText().toString()); 


     if (isEmpty(meditText5)== true){ 
      meditText5.setText("0"); 
      gradnum3 = Double.parseDouble(meditText5.getText().toString()); 
     } 
     else gradnum3 = Double.parseDouble(meditText5.getText().toString()); 


     if (isEmpty(meditText7)== true){ 
      meditText7.setText("0"); 
      gradnum4 = Double.parseDouble(meditText7.getText().toString()); 
     } 
     else gradnum4 = Double.parseDouble(meditText7.getText().toString()); 


     if (isEmpty(meditText9)== true){ 
      meditText9.setText("0"); 
      gradnum5 = Double.parseDouble(meditText9.getText().toString()); 
     } 
     else gradnum5 = Double.parseDouble(meditText9.getText().toString()); 


     if (isEmpty(meditText11)== true){ 
      meditText11.setText("0"); 
      gradnum6 = Double.parseDouble(meditText11.getText().toString()); 
     } 
     else gradnum6 = Double.parseDouble(meditText11.getText().toString()); 

     hournum1 = Double.parseDouble(meditText2.getText().toString()); 
     hournum2 = Double.parseDouble(meditText4.getText().toString()); 
     hournum3 = Double.parseDouble(meditText6.getText().toString()); 
     hournum4 = Double.parseDouble(meditText8.getText().toString()); 
     hournum5 = Double.parseDouble(meditText10.getText().toString()); 

     if (isEmpty(meditText12)== true){ 
      meditText12.setText("0"); 
      hournum6 = Double.parseDouble(meditText12.getText().toString()); 
     } 
     else hournum6 = Double.parseDouble(meditText12.getText().toString()); 


     pointsum = (gradnum1*hournum1) + (gradnum2*hournum2) + (gradnum3*hournum3) + (gradnum4*hournum4) + (gradnum5*hournum5) + (gradnum6*hournum6); 

     return pointsum; 
    } 


    private double CalculateHours() { // adding numb of hours 

     hournum1 = Double.parseDouble(meditText2.getText().toString()); 
     hournum2 = Double.parseDouble(meditText4.getText().toString()); 
     hournum3 = Double.parseDouble(meditText6.getText().toString()); 
     hournum4 = Double.parseDouble(meditText8.getText().toString()); 
     hournum5 = Double.parseDouble(meditText10.getText().toString()); 


     if (isEmpty(meditText12)== true){ 
      meditText12.setText("0"); 
      hournum6 = Double.parseDouble(meditText12.getText().toString()); 
     } 
     else hournum6 = Double.parseDouble(meditText12.getText().toString()); 

     hoursum = hournum1 + hournum2 + hournum3 + hournum4 + hournum5 + hournum6; 
     return hoursum; 
    } 

    private boolean isEmpty (EditText x) { // fuction to check if a certain edit text is empty or not 
     return 
       x.getText().toString().trim().length() == 0; } 



}

AndroidManifest.xml中

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.mainuser.gpa.gpa" > 

    <application 
     android:allowBackup="true" 
     android:icon="@drawable/icon3" 
     android:label="GPA Calculater" 
     android:theme = "@style/AppTheme" > 
     <activity 
      android:name=".MainActivity" 
      android:label="Calculater" 
      > 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 

       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 

    </application> 

</manifest>

activity_main.xml中

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" 
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity" 
    android:background="@android:color/holo_blue_bright"> 

    <TextView 
     android:text="Please insert the following .. " 
     android:layout_width="wrap_content" 
     android:layout_height="wrap_content" 
     android:textColor="@android:color/black" 
     android:id="@+id/viewhello"/> 
    <Button 
     android:layout_width="90dp" 
     android:layout_height="30dp" 
     android:layout_below="@+id/viewhello" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" 
     android:layout_marginTop="70dp" 
     android:id="@+id/Sub1" 
     android:background="@android:color/white" 
     android:text="Subject 1" 
     android:textColor="@android:color/holo_blue_dark"/> 
    <Button 
     android:layout_width="90dp" 
     android:layout_height="30dp" 
     android:layout_below="@+id/Sub1" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" 
     android:layout_marginTop="10dp" 
     android:id="@+id/Sub2" 
     android:background="@android:color/white" 
     android:text="Subject 2" 
     android:textColor="@android:color/holo_blue_dark"/> 
    <Button 
     android:layout_width="90dp" 
     android:layout_height="30dp" 
     android:layout_below="@+id/Sub2" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" 
     android:layout_marginTop="10dp" 
     android:id="@+id/Sub3" 
     android:background="@android:color/white" 
     android:text="Subject 3" 
     android:textColor="@android:color/holo_blue_dark"/> 
    <Button 
     android:layout_width="90dp" 
     android:layout_height="30dp" 
     android:layout_below="@+id/Sub3" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" 
     android:layout_marginTop="10dp" 
     android:id="@+id/Sub4" 
     android:background="@android:color/white" 
     android:text="Subject 4" 
     android:textColor="@android:color/holo_blue_dark"/> 
    <Button 
     android:layout_width="90dp" 
     android:layout_height="30dp" 
     android:layout_below="@+id/Sub4" 
     android:layout_alignParentLeft="true" 
     android:layout_alignParentStart="true" 
     android:layout_marginTop="10dp" 
     android:id="@+id/Sub5" 
     android:background="@android:color/white" 
     android:text="Subject 5" 
     android:textColor="@android:color/holo_blue_dark"/> 
    <Button 
    android:layout_width="90dp" 
    android:layout_height="30dp" 
    android:layout_below="@+id/Sub5" 
    android:layout_alignParentLeft="true" 
    android:layout_alignParentStart="true" 
    android:layout_marginTop="10dp" 
    android:id="@+id/Sub6" 
    android:background="@android:color/white" 
    android:text="Subject 6" 
    android:textColor="@android:color/holo_blue_dark" 
    /> 

    <Button 
     android:layout_width="90dp" 
     android:layout_height="30dp" 
     android:id="@+id/calculate" 
     android:background="@android:color/white" 
     android:text="Calculate" 
     android:textColor="@android:color/holo_blue_dark" 
     android:layout_below="@+id/editText11" 
     android:layout_marginTop="30dp" 
     android:layout_alignLeft="@+id/editText11" 
     android:layout_alignStart="@+id/editText11" 
     /> 

    <EditText 
     android:layout_width="90dp" 
     android:layout_height="30dp" 
     android:inputType="numberDecimal" 
     android:ems="10" 
     android:id="@+id/editText1" 
     android:layout_alignTop="@+id/Sub1" 
     android:layout_centerHorizontal="true" 
     android:layout_marginTop="10dp" 
     android:textSize="12sp" 
     android:textColor="@android:color/black" 

     android:selectAllOnFocus="true"/> 
    <EditText 
     android:layout_width="90dp" 
     android:layout_height="30dp" 
     android:inputType="numberDecimal" 
     android:ems="10" 
     android:id="@+id/editText2" 
     android:layout_alignTop="@+id/editText1" 
     android:layout_toRightOf="@+id/editText1" 
     android:layout_toEndOf="@+id/editText1" 
     android:textSize="12sp" 
     android:textColor="@android:color/black" 

     android:selectAllOnFocus="true"/> 

     <EditText 
     android:layout_width="90dp" 
     android:layout_height="30dp" 
     android:inputType="numberDecimal" 
     android:ems="10" 
     android:id="@+id/editText3" 
     android:layout_below="@+id/editText1" 
     android:layout_centerHorizontal="true" 
     android:layout_marginTop="10dp" 
     android:textSize="12sp" 
     android:textColor="@android:color/black" 

     android:selectAllOnFocus="true" 

     /> 

    <EditText 
     android:layout_width="90dp" 
     android:layout_height="30dp" 
     android:inputType="numberDecimal" 
     android:ems="10" 
     android:id="@+id/editText4" 
     android:layout_alignTop="@+id/editText3" 
     android:layout_alignLeft="@+id/editText2" 
     android:layout_alignStart="@+id/editText2" 
     android:textSize="12sp" 
     android:textColor="@android:color/black" 

     android:selectAllOnFocus="true"/> 


    <EditText 
     android:layout_width="90dp" 
     android:layout_height="30dp" 
     android:inputType="numberDecimal" 
     android:ems="10" 
     android:id="@+id/editText5" 
     android:layout_below="@+id/editText3" 
     android:layout_centerHorizontal="true" 
     android:layout_marginTop="10dp" 
     android:textSize="12sp" 
     android:textColor="@android:color/black" 

     android:selectAllOnFocus="true" 
     /> 
    <EditText 
     android:layout_width="90dp" 
     android:layout_height="30dp" 
     android:inputType="numberDecimal" 
     android:ems="10" 
     android:id="@+id/editText6" 
     android:layout_alignTop="@+id/editText5" 
     android:layout_toRightOf="@+id/editText5" 
     android:layout_toEndOf="@+id/editText1" 
     android:textSize="12sp" 
     android:textColor="@android:color/black" 
     android:selectAllOnFocus="true"/> 

    <EditText 
     android:layout_width="90dp" 
     android:layout_height="30dp" 
     android:inputType="numberDecimal" 
     android:ems="10" 
     android:id="@+id/editText7" 
     android:layout_below="@+id/editText5" 
     android:layout_centerHorizontal="true" 
     android:layout_marginTop="10dp" 
     android:textSize="12sp" 
     android:textColor="@android:color/black" 
     android:selectAllOnFocus="true" 
     /> 
    <EditText 
     android:layout_width="90dp" 
     android:layout_height="30dp" 
     android:inputType="numberDecimal" 
     android:ems="10" 
     android:id="@+id/editText8" 
     android:layout_alignTop="@+id/editText7" 
     android:layout_toRightOf="@+id/editText7" 
     android:layout_toEndOf="@+id/editText1" 
     android:textSize="12sp" 
     android:textColor="@android:color/black" 
     android:selectAllOnFocus="true"/> 

    <EditText 
     android:layout_width="90dp" 
     android:layout_height="30dp" 
     android:inputType="numberDecimal" 
     android:ems="10" 
     android:id="@+id/editText9" 
     android:layout_below="@+id/editText7" 
     android:layout_centerHorizontal="true" 
     android:layout_marginTop="10dp" 
     android:textSize="12sp" 
     android:textColor="@android:color/black" 
     android:selectAllOnFocus="true"/> 
    <EditText 
     android:layout_width="90dp" 
     android:layout_height="30dp" 
     android:inputType="numberDecimal" 
     android:ems="10" 
     android:id="@+id/editText10" 
     android:layout_alignTop="@+id/editText9" 
     android:layout_toRightOf="@+id/editText9" 
     android:layout_toEndOf="@+id/editText1" 
     android:textSize="12sp" 
     android:textColor="@android:color/black" 
     android:selectAllOnFocus="true"/> 

    <EditText 
     android:layout_width="90dp" 
     android:layout_height="30dp" 
     android:inputType="numberDecimal" 
     android:ems="10" 
     android:id="@+id/editText11" 
     android:layout_below="@+id/editText9" 
     android:layout_centerHorizontal="true" 
     android:layout_marginTop="10dp" 
     android:textSize="12sp" 
     android:textColor="@android:color/black" 

     android:selectAllOnFocus="true" 
     /> 
    <EditText 
     android:layout_width="90dp" 
     android:layout_height="30dp" 
     android:inputType="numberDecimal" 
     android:ems="10" 
     android:id="@+id/editText12" 
     android:layout_alignTop="@+id/editText11" 
     android:layout_toRightOf="@+id/editText11" 
     android:layout_toEndOf="@+id/editText1" 
     android:textSize="12sp" 
     android:textColor="@android:color/black" 

     android:selectAllOnFocus="true" 

     /> 
    <Button 
    android:layout_width="90dp" 
    android:layout_height="30dp" 
    android:id="@+id/GPA" 
    android:background="@android:color/white" 
    android:text="SEM GPA" 
    android:textColor="@android:color/holo_blue_dark" 
    android:layout_below="@+id/calculate" 
    android:layout_alignLeft="@+id/editText11" 
    android:layout_alignStart="@+id/editText11" 
    android:layout_marginTop="30dp" /> 

    <Button 
     android:layout_width="90dp" 
     android:layout_height="30dp" 
     android:id="@+id/Hours" 
     android:background="@android:color/white" 
     android:text="Hours" 
     android:textColor="@android:color/holo_blue_dark" 
     android:layout_above="@+id/editText1" 
     android:layout_toRightOf="@+id/editText1" 
     android:layout_toEndOf="@+id/editText1" /> 

    <Button 
     android:layout_width="90dp" 
     android:layout_height="30dp" 
     android:id="@+id/Grade" 
     android:background="@android:color/white" 
     android:text="Grade" 
     android:textColor="@android:color/holo_blue_dark" 
     android:layout_alignTop="@+id/Hours" 
     android:layout_toLeftOf="@+id/Hours" 
     android:layout_toStartOf="@+id/Hours" /> 
    <TextView 
     android:layout_width="90dp" 
     android:layout_height="30dp" 
     android:ems="10" 
     android:id="@+id/showResultTV" 
     android:textColor="@android:color/black" 
     android:textSize="16sp" 
     android:layout_alignTop="@+id/GPA" 
     android:layout_alignLeft="@+id/editText12" 
     android:layout_alignStart="@+id/editText12" 
     android:layout_marginLeft="19dp" 
     android:layout_marginStart="19dp" 
     android:gravity="center_vertical" /> 




</RelativeLayout>

logcat的

07-02 07:27:09.970 1193-1193/com.mainuser.gpa.gpa W/ActivityThread﹕ Application com.mainuser.gpa.gpa is waiting for the debugger on port 8100... 
07-02 07:27:10.020 1193-1193/com.mainuser.gpa.gpa I/System.out﹕ Sending WAIT chunk 
07-02 07:27:14.140 1193-1199/com.mainuser.gpa.gpa I/dalvikvm﹕ Debugger is active 
07-02 07:27:14.340 1193-1193/com.mainuser.gpa.gpa I/System.out﹕ Debugger has connected 
07-02 07:27:14.340 1193-1193/com.mainuser.gpa.gpa I/System.out﹕ waiting for debugger to settle... 
07-02 07:27:14.560 1193-1193/com.mainuser.gpa.gpa I/System.out﹕ waiting for debugger to settle... 
07-02 07:27:14.780 1193-1193/com.mainuser.gpa.gpa I/System.out﹕ waiting for debugger to settle... 
07-02 07:27:14.980 1193-1193/com.mainuser.gpa.gpa I/System.out﹕ waiting for debugger to settle... 
07-02 07:27:15.180 1193-1193/com.mainuser.gpa.gpa I/System.out﹕ waiting for debugger to settle... 
07-02 07:27:15.800 1193-1193/com.mainuser.gpa.gpa I/System.out﹕ waiting for debugger to settle... 
07-02 07:27:16.000 1193-1193/com.mainuser.gpa.gpa I/System.out﹕ waiting for debugger to settle... 
07-02 07:27:16.220 1193-1193/com.mainuser.gpa.gpa I/System.out﹕ waiting for debugger to settle... 
07-02 07:27:17.840 1193-1193/com.mainuser.gpa.gpa I/System.out﹕ debugger has settled (1632) 
07-02 07:27:20.890 1193-1193/com.mainuser.gpa.gpa D/AndroidRuntime﹕ Shutting down VM 
07-02 07:27:20.890 1193-1193/com.mainuser.gpa.gpa W/dalvikvm﹕ threadid=1: thread exiting with uncaught exception (group=0xb1ae8ba8) 
07-02 07:27:21.980 1193-1193/com.mainuser.gpa.gpa E/AndroidRuntime﹕ FATAL EXCEPTION: main 
    Process: com.mainuser.gpa.gpa, PID: 1193 
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mainuser.gpa.gpa/com.mainuser.gpa.gpa.MainActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity. 
      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195) 
      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245) 
      at android.app.ActivityThread.access$800(ActivityThread.java:135) 
      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196) 
      at android.os.Handler.dispatchMessage(Handler.java:102) 
      at android.os.Looper.loop(Looper.java:136) 
      at android.app.ActivityThread.main(ActivityThread.java:5017) 
      at java.lang.reflect.Method.invokeNative(Native Method) 
      at java.lang.reflect.Method.invoke(Method.java:515) 
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 
      at dalvik.system.NativeStart.main(Native Method) 
    Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity. 
      at android.support.v7.app.ActionBarActivityDelegate.onCreate(ActionBarActivityDelegate.java:151) 
      at android.support.v7.app.ActionBarActivityDelegateBase.onCreate(ActionBarActivityDelegateBase.java:138) 
      at android.support.v7.app.ActionBarActivity.onCreate(ActionBarActivity.java:123) 
      at com.mainuser.gpa.gpa.MainActivity.onCreate(MainActivity.java:36) 
      at android.app.Activity.performCreate(Activity.java:5231) 
      at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 
      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159) 
      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245) 
      at android.app.ActivityThread.access$800(ActivityThread.java:135) 
      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196) 
      at android.os.Handler.dispatchMessage(Handler.java:102) 
      at android.os.Looper.loop(Looper.java:136) 
      at android.app.ActivityThread.main(ActivityThread.java:5017) 
      at java.lang.reflect.Method.invokeNative(Native Method) 
      at java.lang.reflect.Method.invoke(Method.java:515) 
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 
      at dalvik.system.NativeStart.main(Native Method)

錯誤的logcat

07-02 07:27:21.980 1193-1193/com.mainuser.gpa.gpa E/AndroidRuntime﹕ FATAL EXCEPTION: main 
    Process: com.mainuser.gpa.gpa, PID: 1193 
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.mainuser.gpa.gpa/com.mainuser.gpa.gpa.MainActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity. 
      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195) 
      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245) 
      at android.app.ActivityThread.access$800(ActivityThread.java:135) 
      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196) 
      at android.os.Handler.dispatchMessage(Handler.java:102) 
      at android.os.Looper.loop(Looper.java:136) 
      at android.app.ActivityThread.main(ActivityThread.java:5017) 
      at java.lang.reflect.Method.invokeNative(Native Method) 
      at java.lang.reflect.Method.invoke(Method.java:515) 
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 
      at dalvik.system.NativeStart.main(Native Method) 
    Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity. 
      at android.support.v7.app.ActionBarActivityDelegate.onCreate(ActionBarActivityDelegate.java:151) 
      at android.support.v7.app.ActionBarActivityDelegateBase.onCreate(ActionBarActivityDelegateBase.java:138) 
      at android.support.v7.app.ActionBarActivity.onCreate(ActionBarActivity.java:123) 
      at com.mainuser.gpa.gpa.MainActivity.onCreate(MainActivity.java:36) 
      at android.app.Activity.performCreate(Activity.java:5231) 
      at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 
      at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159) 
      at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245) 
      at android.app.ActivityThread.access$800(ActivityThread.java:135) 
      at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196) 
      at android.os.Handler.dispatchMessage(Handler.java:102) 
      at android.os.Looper.loop(Looper.java:136) 
      at android.app.ActivityThread.main(ActivityThread.java:5017) 
      at java.lang.reflect.Method.invokeNative(Native Method) 
      at java.lang.reflect.Method.invoke(Method.java:515) 
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 
      at dalvik.system.NativeStart.main(Native Method)

來源

2015-07-02 Majazen ـG

請從logcat發佈日誌以調試問題 – Psypher

發佈您的logcat在這裏調試您的問題 –

在logcat中顯示什麼消息？ – Kumar

，首先請您命名爲方法的Java命名約定要求（從小寫，「大寫的原因是類）。

然後在EditText上你的檢查條件是不是空，應該是這樣的：

if (meditText1.getText().toString().isEmpty()) { 
}

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2015-07-02 09:56:32

你的意思是哪種方法？你能給我一個例子..實際上它工作之前，我不知道錯誤 –

所有如果你有：if（isEmpty（meditText3）== true）{......... –

它，因爲你使用新的谷歌的做法，與程序兼容性主題，只是去清單，找到標記和放有效的主題 - @android：style/Theme.AppCompat。

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2015-07-02 11:58:45

找不到與給定名稱相匹配的資源（在'他們'中值'@android：style/AppThem'） –

當我試圖將其更改爲@android時：style/Theme.AppTheme –

不幸的是停止了，可能是由於錯誤的應用

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